/// Copyright (c) 2018 Razeware LLC
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import Foundation
import PromiseKit

public class KooberRideOptionRepository: RideOptionRepository {

  // MARK: - Properties
  let remoteAPI: NewRideRemoteAPI
  let datastore: RideOptionDataStore

  // MARK: - Methods
  public init(remoteAPI: NewRideRemoteAPI,
              datastore: RideOptionDataStore) {
    self.remoteAPI = remoteAPI
    self.datastore = datastore
  }

  public func readRideOptions(availableAt pickupLocation: Location) -> Promise<[RideOption]> {
    return datastore
            .read(availableAt: pickupLocation.id)
            .then { rideOptions in
              self.fetchFromNetworkIfNeeded(pickupLocation: pickupLocation,
                                            rideOptionsFromDatastore: rideOptions)
            }
  }

  private func fetchFromNetworkIfNeeded(pickupLocation: Location,
                                        rideOptionsFromDatastore: [RideOption]) -> Promise<[RideOption]> {
    if !rideOptionsFromDatastore.isEmpty {
      return .value(rideOptionsFromDatastore)
    }
    return remoteAPI
            .getRideOptions(pickupLocation: pickupLocation)
            .then { rideOptions in
              return self.datastore.update(rideOptions: rideOptions, availableAt: pickupLocation.id)
            }

  }
}
